Covers keyboard shortcuts, access keys/accelerators, and navigation by using the keyboard (not the mouse or other input device).

Examples: Ctrl+W not closing the browser window under Windows. Command+N not
opening a new browser window under Mac OS. Alt+left arrow not going to the
previous page
under Linux. Alt not accessing the menu or access keys under Windows. Also, the
debate as to use Alt or Ctrl under linux as the keyboard accelerator key for
shortcuts. Requests for additional keyboard shortcuts.

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User Story

Build: 10-15 0.9.4 branch build
Steps:
1. Launch browser, go menu Tasks.
2. Windows and Linux:
You will find there are a few shortcut keys Ctrl+1, 2, 3... under this menu,
which the underline letter is point to "N", "M", "I"...
So, if you do Ctrl+N will bring up a browser window and Ctrl+M will bring up
a Mail window...etc.
However, if you do Ctrl+1, 2, 3... then will do nothing.
3. Macintosh, there is no underline letters appears under tasks menu, but you
get browser or mail window by doing command+1, 2,...
So, looks like these Ctrl+"numbers" shortcut key are from macintosh
command+"numbers", but not the case for windows and linux Ctrl+"numbers"
shortcut key.

Ylong,
I don't believe the global accelerators listed in menus are even supposed to
work when the menu is open like that.
This is true for most programs. Go to Windows' Wordpad, pull down the edit menu,
and type Ctrl+O. The open dialog doesn't come up.
Try Ctrl+5 when you're not in the menu - when focused in the browser window.
Does it work then?